A wide area network (WAN) may provide network connectivity and services via:

A.
Interconnected network segments (extranets, internets, and virtual private networks)

B.
Interconnected NetBIOS segments (extranets, intranets, and virtual private networks)

C.
Interconnected NetBIOS segments (extranets, internets, and virtual private networks)

D.
Interconnected network segments (extranets, intranets, and virtual private networks)

Explanation:
wide area network (WAN) may be privately operated for a specific user
community, support multiple communication protocols, or provide network connectivity
and services via interconnected network segments (extranets, intranets, and VPNs).